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/*
* To change this template, choose Tools | Templates
* and open the template in the editor.
*/
package test;
import java.awt.BorderLayout;
import java.awt.Color;
import java.awt.Dimension;
import java.awt.Font;
import java.awt.Graphics;
import java.awt.Graphics2D;
import java.awt.GraphicsConfiguration;
import java.awt.GraphicsEnvironment;
import java.awt.RenderingHints;
import java.awt.Shape;
import java.awt.event.MouseEvent;
import java.awt.font.LineMetrics;
import java.awt.geom.Rectangle2D;
import java.awt.image.BufferedImage;
import java.io.File;
import java.io.IOException;
import javax.imageio.ImageIO;
import javax.swing.JFrame;
import javax.swing.JOptionPane;
import javax.swing.JPanel;
import javax.swing.SwingUtilities;
import javax.swing.event.MouseInputListener;
/**
*
* @author fabriceb
*/
public class Scroller extends JPanel implements MouseInputListener {
private static final long serialVersionUID = 1l;
private int nbTile = 10;
private BufferedImage[] imTile = new BufferedImage[nbTile];
private int[] xTile = new int[nbTile];
private int[] yTile = new int[nbTile];
int dx, dy;
int tileWidth, tileHeight;
int anchorX, anchorY;
int areaHeight, areaWidth;
public Scroller() throws IOException {
super();
BufferedImage imageSrc = ImageIO.read(new File("markup1.jpg"));
tileWidth = imageSrc.getWidth();
tileHeight = imageSrc.getHeight();
// Promote image for some acceleration.
GraphicsConfiguration gc = GraphicsEnvironment.getLocalGraphicsEnvironment().getDefaultScreenDevice().getDefaultConfiguration();
BufferedImage image = gc.createCompatibleImage(tileWidth, tileHeight, imageSrc.getTransparency());
Graphics2D g2d = image.createGraphics();
g2d.drawImage(imageSrc, 0, 0, null);
g2d.dispose();
// Layout tiles.
int sideX = (int) Math.ceil(Math.sqrt(nbTile));
int sideY = (int) Math.ceil(nbTile / (float) sideX);
int index = 0;
for (int j = 0; j < sideY && index < nbTile; j++) {
for (int i = 0; i < sideX && index < nbTile; i++, index++) {
imTile[index] = image;
xTile[index] = i * tileWidth;
yTile[index] = j * tileHeight;
}
}
areaWidth = sideX * tileWidth;
areaHeight = sideY * tileHeight;
System.out.println("Area:");
System.out.println("\tTiles: " + nbTile);
System.out.println("\tLayout: " + sideX + " x " + sideY);
System.out.println("\tDimension: " + areaWidth + " x " + areaHeight);
// Set view on area center.
dx = -(areaWidth - tileWidth) / 2;
dy = -(areaHeight - tileHeight) / 2;
//
setFont(getFont().deriveFont(Font.BOLD, 15f));
addMouseListener(this);
addMouseMotionListener(this);
}
/**
* {@inheritDoc}
*/
@Override
protected void paintComponent(Graphics g) {
super.paintComponent(g);
Dimension size = getSize();
Graphics2D g2d = (Graphics2D) g.create();
try {
g2d.setRenderingHint(RenderingHints.KEY_TEXT_ANTIALIASING, RenderingHints.VALUE_TEXT_ANTIALIAS_ON);
Font font = g2d.getFont();
g2d.setColor(Color.BLACK);
Shape clip = g2d.getClip();
for (int i = 0; i < nbTile; i++) {
// Optimised painting.
// Paint only what is visible.
if (clip.intersects(dx + xTile[i], dy + yTile[i], imTile[i].getWidth(), imTile[i].getHeight())) {
g2d.drawImage(imTile[i], dx + xTile[i], dy + yTile[i], null);
String label = "Tile " + i;
LineMetrics lineMetrics = font.getLineMetrics(label, g2d.getFontRenderContext());
g2d.drawString(label, dx + xTile[i], dy + yTile[i] + lineMetrics.getAscent());
}
else {
//System.out.println("Tile " + i + " outside of bounds : not painted.");
}
}
String label = "dx: " + dx + ", dy: " + dy;
Rectangle2D labelBounds = font.getStringBounds(label, g2d.getFontRenderContext());
LineMetrics lineMetrics = font.getLineMetrics(label, g2d.getFontRenderContext());
g2d.setColor(new Color(128, 128, 255, 128));
g2d.fillRect(0, size.height - (int) labelBounds.getHeight(), (int) labelBounds.getWidth(), (int) labelBounds.getHeight());
g2d.setColor(Color.BLACK);
g2d.drawString(label, 0, size.height - (float) labelBounds.getHeight() + lineMetrics.getAscent());
}
finally {
g.dispose();
}
}
/**
* {@inheritDoc}
*/
@Override
public void mouseClicked(MouseEvent e) {
if (SwingUtilities.isMiddleMouseButton(e)) {
dx = -(areaWidth - tileWidth) / 2;
dy = -(areaHeight - tileHeight) / 2;
repaint();
}
}
/**
* {@inheritDoc}
*/
@Override
public void mousePressed(MouseEvent e) {
anchorX = e.getX();
anchorY = e.getY();
}
/**
* {@inheritDoc}
*/
@Override
public void mouseReleased(MouseEvent e) {
}
/**
* {@inheritDoc}
*/
@Override
public void mouseEntered(MouseEvent e) {
}
/**
* {@inheritDoc}
*/
@Override
public void mouseExited(MouseEvent e) {
}
/**
* {@inheritDoc}
*/
@Override
public void mouseDragged(MouseEvent e) {
Dimension size = getSize();
int dx = this.dx + e.getX() - anchorX;
int dy = this.dy + e.getY() - anchorY;
dx = Math.min(dx, 0);
dx = Math.max(dx, -(areaWidth - size.width));
dy = Math.min(dy, 0);
dy = Math.max(dy, -(areaHeight - size.height));
anchorX = e.getX();
anchorY = e.getY();
this.dx = dx;
this.dy = dy;
repaint();
}
/**
* {@inheritDoc}
*/
@Override
public void mouseMoved(MouseEvent e) {
}
/**
* @param args the command line arguments
*/
public static void main(String[] args) {
// TODO code application logic here
SwingUtilities.invokeLater(new Runnable() {
/**
* {@inheritDoc}
*/
@Override
public void run() {
try {
Scroller scroller = new Scroller();
JFrame frame = new JFrame("Test");
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
frame.setLayout(new BorderLayout());
frame.add(scroller, BorderLayout.CENTER);
frame.setSize(500, 500);
frame.setLocationRelativeTo(null);
frame.setVisible(true);
}
catch (Exception e) {
e.printStackTrace();
JOptionPane.showMessageDialog(null, e.getMessage(), "Error", JOptionPane.ERROR_MESSAGE);
}
}
});
}
} |
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